1. Ph.D. Candidate, Washington Univ. in St. Louis, St. Louis, MO 63130 (corresponding author).
2. Edward C. Dicke Professor of Engineering, Washington Univ. in St. Louis, St. Louis, MO 63130.
3. Assistant Professor, Univ. of Akron, Akron, OH 44325; formerly, Postdoctoral Researcher, Washington Univ. in St. Louis, St. Louis, MO 63130
4. Clifford W. Murphy Professor of Civil Engineering, Washington Univ. in St. Louis, St. Louis, MO 63130.